Full Duplex Wireless Transmission with Self-Interference Cancellation

Active Publication Date: 2013-11-14
KHANDANI AMIR KEYVAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These alternatives have their relative pros and cons, but both suffer from lack of ability to transmit and to receive simultaneously and over the entire frequency band.
It is well known that two-way wireless is theoretically possible, but it is widely believed to be difficult to implement due to a potentially large amount of interference, called self-interference, between transmit and receive chains of th

Method used

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  • Full Duplex Wireless Transmission with Self-Interference Cancellation
  • Full Duplex Wireless Transmission with Self-Interference Cancellation
  • Full Duplex Wireless Transmission with Self-Interference Cancellation

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embodiment 700

[0057]FIG. 7 depicts an alternative embodiment 700 of pre-processing the auxiliary transmit signal. In this embodiment, only the auxiliary transmit signal is preprocessed by preprocessor 704. The filter response used by preprocessor 704 is the negative ratio of the channel estimate (H1+ΔH1) for the primary self-interference channel H1 to the channel estimate (H2+ΔH2) for the self-interference cancellation channel response H2. After the combination of the self-interference signal from the primary transmit chain is combined with the preprocessed auxiliary transmit signal that traverses H2, a residual interference signal remains after the RF addition. This residual signal is separately measured at the receiver baseband processor, as described more fully below, and is referred to herein as the residual self-interference baseband channel response.

[0058]FIGS. 8 to 11 show block diagrams representing transmit and receive chains, in accordance with examples of embodiments of the full-duplex...

embodiment 800

[0065]In the embodiment 800 illustrated, the amplified signal from amplifier 804 is transmitted, via a pair-wise symmetrical transmit antenna whereas the amplified signal from amplifier 820 is output for combining with a received signal from a pair-wise symmetrical receive antenna of receiver 832 via RF coupling unit 834. A low noise amplifier 836 amplifies the combined received and injected signal. The amplified signal is demodulated (by demodulator 838) and analog to digital conversion is performed at A / D Unit 840. The digital signal is passed to FFT unit 842 and thereafter to RX base-band 844, which provides received data 848 and information (measurements) to weights calculation unit 846.

[0066]FIG. 9 depicts an embodiment where the received signal and the self-interfering signal are first amplified by LNA 906 before being combined with the self-interference cancellation signal from the auxiliary transmitter chain. In a further alternative embodiment, the LNA 904 may be omitted.

embodiment 1000

[0067]FIG. 10 depicts an embodiment 1000 where the auxiliary chain 1002 generates a self-interference cancellation signal in the form of an analog baseband signal, which is added in the received chain 1004 by baseband adder 1006.

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Abstract

Two-way (full-duplex) wireless communications. Various embodiments measure interference channels and provide for interference cancellation in both analog and digital domains to mitigate self-interference. The system supports multiple clients wherein new clients can join the network asynchronously, and also supports Multiple-Input Multiple-Output (MIMO) antennas.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a non-provisional filing of, and claims benefit under 35 U.S.C. §119(e) from, U.S. Provisional Patent Application Ser. No. 61 / 646,312, filed May 13, 2012, and U.S. Provisional Patent Application Ser. No. 61 / 771,815, filed Mar. 2, 2013, both of which are hereby incorporated herein by reference. In addition, this application is related to the following applications, all of which are also incorporated herein by reference: Attorney docket 71501.US.01 entitled Wireless Transmission with Channel State Perturbation, filed May 13, 2013, Attorney Docket 71502.US.01, entitled Full Duplex Wireless Transmission with Channel Phase-Based Encryption, filed May 13, 2013, and Attorney docket 71503.US.01, entitled Distributed Collaborative Signaling in Full Duplex Wireless Transceivers, filed May 13, 2013.FIELD[0002]The present disclosure relates to wireless communications. In particular, the present disclosure relates to systems...

Claims

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Application Information

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IPC IPC(8): H04L5/14H04B7/04
CPCH04L5/14H04B7/0413H04B7/026H04B7/0417H04B7/0626H04B7/10H04B7/0669H04B1/123H04B1/525H04L1/1825H04L1/1896H04L2001/0097H04W16/14H04W12/04H04B7/0478H04L1/18
Inventor KHANDANI, AMIR KEYVAN
Owner KHANDANI AMIR KEYVAN
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